Introduction
Surprisingly, new research shows that emissions from modern gasoline cars can become more toxic after sunlight exposure. Even vehicles with advanced filters aren’t as safe as we once thought. This challenges the idea that current emission standards fully protect public health.
The Study at a Glance
Scientists from Helmholtz Munich and the University of Rostock studied a car that meets EURO 6d standards. It also had a gasoline particulate filter (GPF). At first, its emissions seemed harmless to human lung cells.
However, when researchers simulated real-world conditions—like sunlight and air reactions—the emissions changed. They became far more toxic.
Key Findings
Photochemical Aging
When car emissions meet sunlight, they go through a process called photochemical aging. As a result, their chemical structure changes.
Increased Toxicity
After aging, these emissions caused damage to DNA. They also triggered oxidative stress in both cancerous and healthy lung cells.
Secondary Pollutants
The toxic effects came from new particles formed in the air. These included secondary organic aerosols, inorganic aerosols, and volatile compounds such as carbonyls.
Implications for Emission Standards
According to Dr. Mathilde Delaval, current emission tests only check what comes out of the tailpipe. They don’t account for how emissions change in the environment. This is a major gap in regulation.
Dr. Hendryk Czech added that this oversight could mean we are underestimating the true health risks of vehicle pollution.
A Call for Comprehensive Regulations
This study suggests we need to rethink how emissions are tested and regulated. Today’s rules might not protect us from harmful particles formed in the air.
As air pollution continues to affect global health, understanding every stage of emission behavior is more important than ever.
More information: Mathilde N. Delaval et al, The efficiency of EURO 6d car particulate filters is compromised by atmospheric aging: In vitro toxicity of gasoline car exhaust, Science Advances (2025). DOI: 10.1126/sciadv.adq2348
Curious to Learn More?
How will this discovery impact future laws on car emissions and air quality? As concern grows about environmental issues 2025 and global warming updates 2025, this research could guide better policies.
Stay tuned to DailySciTech.com for the latest science news 2025, exciting new science research 2025, and updates in science and technology news that shape our world and health.
